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What is the role and principle of the power adapter?input voltage and output voltage
2017/9/26 7:43:17 / Editor - yoyo / Source - elecfans

Power adapter, also known as external power supply (switching power adapter), it is a small portable electronic equipment and electronic appliances power sub-device.This is due to in real lifeúČelectronic equipment usually can not directly use domestic electricity . At home,we use a 220 volt supply voltage, and universal electronic products generally require a supply voltage of 5 volts to about 20 volts. So the role of power adapter is essential (module power), especially if you go to the United States and other countries, the voltage in USA and China  are different, it needs the transformer make it from 220V turn to 110V.


Through it, we can easily and safely use these electronic products. So what is the role of the power adapter?

Power adapter composition and application (power adapter works)

Power adapters are commonly use in small electronic products such as mobile phones, liquid crystal displays and laptops. 

Generally by the enclosure, power transformers and rectifier circuit,it can be divided into AC output and DC output type according to its output type; It can be divided into wall-mount and desktop according to the connection.


Widely supporting the phone son machine, game consoles, language repeaters, Walkman, notebook computers, cellular phones and other equipments.


Computer power adapter

Power adapter is widely used in industrial automation and control, military equipment, scientific research equipment, LED lighting, industrial equipment, communications equipment, electrical equipment, instrumentation, medical equipment, semiconductor refrigeration heating, air purifier, electronic refrigerator, , Communications equipment, audio-visual products, security, computer chassis, digital products and instruments and other fields, and it has a role that can not be ignored in these areas . So what is the role of the power adapter?

The role of the power adapter

In general, the power adapter is the role of transformers and rectifiers.  Domestic AC is 220v, and our computer is DC 12v (as if), so the power adapter is a transformer and rectifier. Adapter is a transformer, then we should know that AC 220v through the transformer to transform, through the rectifier to DC, here is the consumption, and these consumption will be converted into heat, so it is normal that the power adapter will heat.


Transformer is made of silicon steel, the transformer power, resulting in magnetic flux, magnetic flux will lead to the formation of silicon steel between the role, resulting in buzzing sound, which is normal. But too much noise is not normal, for many reasons: 1, AC voltage instability. 2, chip damage. 3, inter-turn short circuit. 4, component damage and so on. By the way, the role of the adapter is to convert AC power into direct current to supply the  electronic products


Power adapter space is generally built-in, the general size of the adapter is not small, small size of the machines are external, in order to save space, to replace the convenience of the adapter with the mains, the voltage is relatively high, put the machine inside is more dangerous.

Power adapter

Use the power adapter to pay attention to some of the problems

In the power adapter (hereinafter referred to as adapter) above the label will generally have a few need to pay attention.


The first is the adapter model, for example, this adapter model is XVE-120100, it tells us a few information, that is, its manufacturers, wattage, etc., XVE is the beginning of the # # company code, 120100 is to explain this adapter is 12W, 050200 is 10W;


Second, the adapter INPUT (input), generally in China is 100-240V ~ 50-60Hz, which shows that the adapter can be 100V-240V voltage below the normal work;


The third is the adapter OUTPUT (output), the two figures can be very fast to calculate the adapter wattage, such as the adapter, voltage 12V * current 1A = 12W (power), that the power is 12W adapter.


Most laptop power adapters can be used for 100 ~ 240V AC (50 / 60Hz). Basically, most of the notebook computers are external power supply, with a power cord and the host connection, which can reduce the size and weight of the host, only a very small number of models built in the host power.


In the power adapter has a nameplate, marked above the power, input and output voltage and current and other indicators, with particular attention to the input voltage range, which is the so-called "travel power adapter", if the city voltage to only 110V country , This feature is very useful, and some parallel notebook computers are sold only in the origin, there is no such compatible voltage design, or even only a single 110V input voltage, in our 220V mains voltage will be burned to burn.


The role of the power adapter is to convert the home's high voltage into a stable low voltage to work, so that they can work properly. And without it will give us the daily use of a lot of inconvenience. This article describes the role of the power adapter, composition and application of the power adapter and the need to pay attention to some of the problems.

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